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CAIE A-Level Chemistry AS 3.6 Intermolecular Forces and Bond Properties Questions

Practise identifying intermolecular forces and using molecular size, polarity and hydrogen bonding to explain properties.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • identify id–id forces in every molecular substance and add pd–pd forces for polar molecules
  • identify hydrogen bonding only when the required N–H or O–H donor and lone-pair acceptor are present
  • compare physical properties through intermolecular-force strength without confusing them with covalent bond energy

Covered syllabus points

3.6.1—Hydrogen bonding3.6.2—Electronegativity and bond polarity3.6.3—Van der Waals’ forces as the intermolecular3.6.4—That, in general, ionic, covalent and metallic

Question 1

[Maximum number: 1]

The graph shows the boiling points of the hydrogen compounds of Group 16 elements.

Figure for Question 1 — CAIE A-Level Chemistry AS

Which statement correctly explains why water does not fit the trend of the other compounds?

A

There are fewer electrons in the oxygen atoms so there is less shielding of the nuclear charge.

B

There are strong hydrogen bonds in water but not in the other compounds.

C

The covalent bonds in water are much stronger than in the other compounds.

D

The water molecules are smaller and so have stronger van der Waals' forces.

Question 2

[Maximum number: 1]

For which molecule is the dipole moment zero?

A

CH3Cl\mathrm{CH}_{3} \mathrm{Cl}

B

CH2Cl2\mathrm{CH}_{2} \mathrm{Cl}_{2}

C

CHCl3\mathrm{CHCl}_{3}

D

CCl4\mathrm{CCl}_{4}

Question 3

[Maximum number: 1]

Consider the following four compounds.
1(CH3)3CH1\left(\mathrm{CH}_{3}\right)_{3} \mathrm{CH}2CH3CH2CH2OH2 \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{OH}3CH3CH2CH2SH3 \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{SH}4CH3CH2CH2CH34 \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{3}
What is the order of increasing boiling point of the compounds (lowest first)?

A

1→4→2→31 \rightarrow 4 \rightarrow 2 \rightarrow 3

B

1→4→3→21 \rightarrow 4 \rightarrow 3 \rightarrow 2

C

4→1→2→34 \rightarrow 1 \rightarrow 2 \rightarrow 3

D

4→1→3→24 \rightarrow 1 \rightarrow 3 \rightarrow 2

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